lacunaryEnglishOxford New American Dictionarylacunary /ˈlakyəˌnerē, , ˈlækjəˌnɛri , ləˈk(y)o͞onərē, ləˈk(j)unəri / ▸ adjective having gaps or missing portions: the lacunary nature of recollected experience both the index and the bibliography are lacunary. – ORIGIN mid 19th century : from lacuna + -ary2.